What is the name of the Japanese student dance where men and women get together to exchange dances every once in a while?

That kind of dance is called "フォークダンス" in Japanese, which means "folk dance" in English.

I think you may mean "ォクラホマミキサー". This is a folk song that was born in America in the early19th century. It is very popular in Japan, and most children who have attended junior high school in Japan should know it. The English name is "Turkey in the Straw".

The reference website is,

1, A Brief Introduction to Turkey in Straw in English

Sorry, the website of 1 cannot be published due to the word limit. You can enter "Turkey in Straw Wiki" and search it out.

2. Enjoy the "Oklahoma Blender"

Step 3 enjoy the "turkey in the straw"

When I was in forest school in junior high school, everyone lit a bonfire and danced the Oklahoma mixer together. At first, everyone was a little shy, but later they had a good time! Good memories forever. .